PROC SURVEYSELECT provides a variety of methods for selecting probability-based random samples. With probability sampling, each unit in the survey population has a known, positive probablity of ...

Controlling bias in observational studies: a review William G. Cochran Part II. Univariate Matching Methods and the Dangers of Regression Adjustment: 3. Matching to remove bias in observational ...

When sampling a population, the numbers of organisms are counted within a sample site, and then the results multiplied to estimate the total number in the entire habitat. Large animals and plants ...

Mielke, Paul W. and Berry, Kenneth J. 1999. Capture-Recapture Methodology: Direct and Inverse Sampling. Perceptual and Motor Skills, Vol. 89, Issue. 3, p. 748.

If you are using the wrong kind of sampling method for your experiment, this can lead to biased results. Sampling of the area you are studying must be random. It must show no bias – for instance ...

Enhanced sampling methods, which can handle long timescales, are promising but have mainly been applied to simple systems. There's an urgent need for enhanced sampling methods with broader ...